TheSwissKnife/xbmc — comment on commit bbf0fe22adcc4bc096aed1611c76ef97ef74f40c
File: xbmc/cores/VideoRenderers/LinuxRendererGL.cpp line 810
By FernetMenta:

Consider a still frame and you bring up a window like the codec info. After closing the overlay the frame has to be rendered again. Another example is when playing minimized. Display is at 50Hz and we are playing a 24 Hz movie. There are frames which have to be rendered more than once.